LASER MULTIPHOTON DISSOCIATION-MULTIPHOTON IONIZATION AND PHOTOELECTRON-SPECTROSCOPY OF FE(C5H5)2, CO(C5H5)2, AND NI(C5H5)2

Laser multiphoton dissociation-resonance-enhanced multiphonon ionization (MPD-REMPI) and time-of-flight photoelectron spectra (TOF-PES) of Fe(C5H5)2, Co(C5H5)2, and Ni (C5H5)2 have been obtained in the range 380-390 nm, and th e M PD-REMPI of Fe(C5H5)2 and Co(C5H5)2 have been obtained in the range 445-455 nm. The only ions produced by the pulsed dye laser are Fe+, Co+, and Ni+. transitions observed in the MPD-REMPI spectra are assigned to resonant states of the neutral atoms. Final states of the atomic ions are determined from the TOF-PES spectra. For Ni and Co, there appears to be a propensity for core preservation of the resonant state upon ionization if the resonant state has an electron configuration with an electron in a d-type Rydberg orbital. For Fe, no such propensity is observed.